Pendleton weather in August

In August, Pendleton sees average daytime highs of 86°F and overnight lows near 58°F, with 0.3 in of rain across 1.4 wet days and about 13.9 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 89°F in the first days to 83°F by the end. The sky is clear or mostly clear about 73% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 36 min at the start of August to 13 h 12 min by month's end. Set against the rest of the year, August is Pendleton's 2nd-clearest and 7th-windiest month. For the whole year in context, see Pendleton's year-round climate.

Daytime high
86°
2nd warmest
Overnight low
58°
11th coldest
Rainfall
0.3 in
1.4 wet days
Daylight
14 hours
5:01 AM – 6:58 PM
Cloud cover
25%
2nd clearest
Wind
6 mph
7th windiest
Solar energy
6.8 kWh/m²
Travel score
6.5
out of 10

Pendleton is city in and seat of Umatilla County, Oregon, United States.

Density
620/km²
people per km²
Founded
1851

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 89°F in the first days to 83°F by the end.

A typical August day in Pendleton reaches about 86°F in the afternoon and slips back to 58°F overnight — a 28°F spread between the day's warmth and the night's chill. On most days the high lands between 76°F and 96°F. Set against its neighbours, August runs on par with July and about 10°F warmer than September.

40°60°80°100°151015202531
Avg high (°F)Avg low (°F)
18961
28961
38961
48960
58960
68960
78860
88860
98860
108860
118860
128759
138759
148759
158759
168659
178658
188658
198658
208558
218558
228557
238457
248457
258457
268356
278356
288356
298356
308255
318255

How August really feels in Pendleton

Once humidity and wind are folded in, August averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Pendleton weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan42° / 30°2.312.64.38.90.2
Feb46° / 31°1.810.43.210.11.3
Mar54° / 35°2.110.91.411.63.1
Apr61° / 40°1.69.40.513.35.1
May70° / 47°1.57.3014.76.9
Jun77° / 53°0.94.6015.47.8
Jul87° / 59°0.21.1015.16.1
Aug86° / 58°0.31.4013.96.5
Sep76° / 51°0.52.9012.38.3
Oct63° / 42°1.57.60.210.75.8
Nov49° / 34°2.3122.19.31.9
Dec41° / 29°2.51358.60.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 73% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 12% of August, with mostly cloudy or overcast conditions the remaining 14%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18911
28911
38812
48812
58812
68614
78614
88614
98515
108515
118515
128416
138416
148416
158416
168416
178416
188416
198416
208416
218515
228515
238515
248614
258614
268614
278614
288614
298614
308515
318515

Chance of precipitation in August

Any precipitation

Pendleton gets around 0.3 in of rain over 1.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 5% and peaks near 5% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
13
23
34
44
54
64
74
85
95
105
115
125
135
145
155
165
175
185
195
205
215
224
234
244
255
265
275
285
295
305
315

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1973
2973
3973
4973
5973
6973
7973
8973
9973
10973
11982
12982
13982
14982
15982
16982
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in August

Winds average 6 mph in August.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 36 min at the start of August to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over August. Sunrise moves from 4:42 AM to 5:20 AM, and sunset from 7:20 PM to 6:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.64:427:20
214.64:447:19
314.54:457:17
414.54:467:16
514.54:477:15
614.44:487:13
714.44:507:12
814.34:517:10
914.34:527:09
1014.24:537:07
1114.24:547:06
1214.14:567:04
1314.14:577:03
1414.04:587:01
1514.04:596:59
1614.05:016:58
1713.95:026:56
1813.95:036:54
1913.85:056:53
2013.85:066:51
2113.75:076:49
2213.75:086:47
2313.65:106:46
2413.55:116:44
2513.55:126:42
2613.45:136:40
2713.45:156:38
2813.35:166:36
2913.35:176:35
3013.25:186:33
3113.25:206:31

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.8 kWh/m².

For context, solar energy here swings from a low near 1.29 kWh/m² to a high of 7.84 kWh/m² in July across the year — August's 6.8 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.4Intense
37.4Intense
47.3Intense
57.3Intense
67.3Intense
77.2Intense
87.2Intense
97.1Intense
107.1Intense
117.0Intense
127.0Intense
137.0Intense
146.9Intense
156.9Intense
166.8Intense
176.8Intense
186.7Intense
196.7Intense
206.6Intense
216.6Intense
226.5Intense
236.5Intense
246.4Intense
256.3Intense
266.3Intense
276.2Intense
286.2Intense
296.1Intense
306.1Intense
316.0Intense
Planning a trip in August

Is August a good time to visit Pendleton?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.5
Sightseeing
4th-best month of the year
8.7
Beach & pool
1st-best month of the year

August is a reasonable time to visit Pendleton for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Pendleton in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Pendleton sees daytime highs around 86°F and nights near 58°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Pendleton in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Pendleton peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 15UV 8Dec 14UV 1
UV index (midday)Level
Jan2Low
Feb2Low
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul9Very high
Aug6High
Sep5Moderate
Oct4Moderate
Nov1Low
Dec1Low

Air quality in Pendleton in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Pendleton is worst in August — around 29 µg/m³ PM2.5 (moderate), about 4.4× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1827 µg/m³Dec 237 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar11Good
Apr11Good
May9Good
Jun9Good
Jul16Moderate
Aug29Moderate
Sep20Moderate
Oct12Moderate
Nov12Good
Dec7Good
Location & terrain

Where is Pendleton?

Pendleton sits at 45.7°N, 118.8°W, 1,066 ft above sea level, in United States. The nearest listed city is Hermiston, 27 mi away.

Topography around Pendleton

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Pendleton.

Within 2 miles, the terrain around Pendleton has only modest variations in elevation — a maximum elevation change of 486 ft around an average of 1,250 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,136 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,581 ft.

The land around Pendleton is covered by grassland (41%), cropland (27%) and artificial surfaces (22%) within 2 miles, cropland (55%) and grassland (41%) within 10 miles, and grassland (43%), cropland (28%) and trees (27%) within 50 miles.

2 miles
486 ft
10 miles
2,136 ft
50 miles
6,581 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Hermiston 27 mi · Walla Walla 35 mi · Kennewick 41 mi · Pasco 42 mi · Tri-Cities 44 mi · Richland 48 mi · Sunnyside 74 mi · Lewiston 99 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Pendleton (45.6721°, -118.7886°, elevation 1,066 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).